static const char* normal_texture_vertex_shader = STRINGIFY(
attribute vec3 position;
attribute vec2 texCoord;
uniform mat4   projection;
uniform mat4   model;
varying vec2  texCoordVarying;
                                                            
void main()
{
    gl_Position = projection * model * vec4(position, 1.0);
    texCoordVarying = texCoord;
}
);